I was looking through an Orvis catalog and noticed this description for a pair of pants:
> … Yak hair is shorn from the fine guard hairs
> beneath the yak's chin. The long, harsh winters
> of the yak's Tibetan and Himalayan range
> contribute to the hairs being as soft as cashmere…
If you're Tibetan, sure, use yak hair. If you're a suburban catalog shopper, maybe not.
I also wonder about collecting the yak hair. Taken from the yak's chin, they wrote. Is “yak shaver” really a profession in some mountainous region? Are there clean-shaven yaks wandering around? What other hair on a yak is soft? I guess the yak is more docile when approached from the front so we'll never know.